Urine is the liquid waste product excreted by the kidneys. It is stored in the bladder until it is emptied out through the urethra.

Review Date:
8/14/2011
Reviewed By:
David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.